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shuffle_region.go
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shuffle_region.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package schedulers
import (
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/schedule"
)
func init() {
schedule.RegisterScheduler("shuffle-region", func(limiter *schedule.Limiter, args []string) (schedule.Scheduler, error) {
return newShuffleRegionScheduler(limiter), nil
})
}
type shuffleRegionScheduler struct {
*baseScheduler
selector schedule.Selector
}
// newShuffleRegionScheduler creates an admin scheduler that shuffles regions
// between stores.
func newShuffleRegionScheduler(limiter *schedule.Limiter) schedule.Scheduler {
filters := []schedule.Filter{
schedule.NewStateFilter(),
schedule.NewHealthFilter(),
}
base := newBaseScheduler(limiter)
return &shuffleRegionScheduler{
baseScheduler: base,
selector: schedule.NewRandomSelector(filters),
}
}
func (s *shuffleRegionScheduler) GetName() string {
return "shuffle-region-scheduler"
}
func (s *shuffleRegionScheduler) GetType() string {
return "shuffle-region"
}
func (s *shuffleRegionScheduler) IsScheduleAllowed(cluster schedule.Cluster) bool {
return s.limiter.OperatorCount(schedule.OpRegion) < cluster.GetRegionScheduleLimit()
}
func (s *shuffleRegionScheduler) Schedule(cluster schedule.Cluster, opInfluence schedule.OpInfluence) []*schedule.Operator {
schedulerCounter.WithLabelValues(s.GetName(), "schedule").Inc()
region, oldPeer := scheduleRemovePeer(cluster, s.GetName(), s.selector)
if region == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_region").Inc()
return nil
}
excludedFilter := schedule.NewExcludedFilter(nil, region.GetStoreIds())
newPeer := scheduleAddPeer(cluster, s.selector, excludedFilter)
if newPeer == nil {
schedulerCounter.WithLabelValues(s.GetName(), "no_new_peer").Inc()
return nil
}
schedulerCounter.WithLabelValues(s.GetName(), "new_operator").Inc()
op := schedule.CreateMovePeerOperator("shuffle-region", cluster, region, schedule.OpAdmin, oldPeer.GetStoreId(), newPeer.GetStoreId(), newPeer.GetId())
op.SetPriorityLevel(core.HighPriority)
return []*schedule.Operator{op}
}